Monday's storm brought 2-4 inches of fresh snow, which was whipped by winds gusting to 40 mph. Temperatures plunged below zero early Tuesday. The winds had eased, but were still strong enough to create wind chills of almost 40 below zero.

At 5 a.m. on Tuesday, the temperature in Mason City dropped to 14 below, with a wind chill of 37 below.

Another system is due to arrive in Iowa Tuesday night, bringing 2-5 inches of snow, more wind and another round of dangerous cold by Wednesday morning.